import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import Users from '../components/user/Users.vue'

Vue.use(VueRouter)

const routes = [{
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  },
  {
    path: '/home',
    component: Home,
    redirect:'/welcome',
    children: [{
      path: '/welcome',
      component: Welcome,
    },{
      path:'/users',
      component:Users
    }]
  },
]
const router = new VueRouter({
  routes
})
// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  // to 将要访问的路径
  // from 代表从哪个路径跳转而来
  // next 是一个函数，表示放行
  // next() 放行   next('/login')  强制跳转
  if (to.path === '/login') return next();
  // 获取token
  const tokenStr = window.sessionStorage.getItem('token');
  //  没有token 强制跳转到 login页面
  if (!tokenStr) return next('/login')
  next()
})

export default router
